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Kane Williamson's men trained for Boxing Day Test on day of festivities
Williamson’s half-century sees hosts claim eight-wicket victory in Christchurch
New Zealand skipper misses training, raising concerns over his fitness for the upcoming match
New Zealand batsman, India leg-spinner within touching distance of summit
30-year-old became first off-spinner to reach milestone in less than 40 matches
Pair added 117 runs for second wicket to take visitors to 152 for one at end of day's play
Hosts last Test series against Black Caps ended in 1-0 away defeat in 2014
Half-centuries from skipper and opener Tom Latham helped visitors put up a challenging first innings score
Coach Mike Heeson believes one needs to find another way on surfaces that aren’t responsive in seam movement
Proteas will start without their captain AB de Villiers and fast-bowler Morne Morkel